Strongly Anisotropic S=1 (Pseudo) Spin Systems: from Mean Field to Quantum Monte-Carlo |
| Yu.D. Panov, A.S. Moskvin, V.V. Konev, E.V. Vasinovich and V.A. Ulitko
Ural Federal University, Ekaterinburg 620083, Russia |
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| The S=1 pseudospin formalism was recently proposed to describe the charge degree of freedom in a model high-Tc cuprate with the on-site Hilbert space reduced to the three effective valence centers, nominally Cu1+;2+;3+. With small corrections the model becomes equivalent to a strongly anisotropic S=1 quantum magnet in an external magnetic field. We have applied a generalized mean-field approach and quantum Monte-Carlo technique for the model 2D S=1 system to find the ground state phase with its evolution under deviation from half-filling and different correlation functions. Special attention is given to the role played by the on-site correlation ("single-ion anisotropy"). |
DOI: 10.12693/APhysPolA.133.426 PACS numbers: 75.10.Hk, 75.10.Jm, 74.25.Dw |